This problem is very difficult.

He is learning how to write an essay.

I write a diary every day.

He wrote a letter and sent it to his friend.

She was thinking with her hand on her forehead.

It's difficult to write an essay on this topic.

There are five questions on the test.

His calligraphy theme expresses the beauty of nature.

It's difficult to remember the stroke order of kanji.

He picked up a pen to write down the poem.